Disable Ctrl-Alt-Delete, Alt-Tab, Ctrl-Esc

Using the SystemParametersInfo function you can
trick Windows into thinking that the screen saver is running. Doing so disables
the Ctrl-Alt-Delete key sequence from rebooting
the PC and Alt-Tab from switching to another
application. It also stops Ctrl-Esc from opening
the Start Menu. For more information on this API, see my System Parameters
Information example.

Click Enable and then Ctrl-Alt-Delete to once again bring up the Task List. Hit
Cancel.

Try the same using the Alt-Tab keys.

Windows NT and Windows 2000

You can disable Ctrl-Alt-Del on NT and 2K but this is very risky. It can prevent
you from ever being able to log on again!

Be sure to enable Automatic Logon by specifying DefaultDomainName,
DefaultUserName, DefaultPassword and AutoAdminLogin in the registry under
Windows Login. Otherwise you will not be able to logon again. See Knowledge
Base article Q114615 for details - there is a link on my links page. You may
also want to read my disclaimer page.

After you set up automatic logon the logon dialog no longer appears at startup.
You are then unable to logon as a different user until the automatic logon and
below code is disabled in the registry. You may be able to temporarily bypass
the automatic logon by holding down the Shift key as windows is starting